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1·The thesis first came up with a problem in projective geometry.

本文首先给出了一道画法几何题。

2·Two projective geometry problems are enumerated in the thesis according to priority.

本文先后列出了两道画法几何题。

3·This paper deals with the graphics of the intersections and common tangents of two conics according to projective geometry .

在射影几何的范畴内，全面地论述了两二次曲线的公有点和公切线的图解问题。

4·Desargues who was a French mathematician in 17th century had made creative achievement in the aspect of projective geometry.

17世纪法国数学家笛沙格在射影几何方面的工作具有创造性成就。

5·These results will take an important part in studying fractional ring (module), localization method and projective geometry.

这些结果无疑对更进一步研究分式环(模)及局部化方法，特别是投射几何代数的研究大有裨益。

6·Based on projective geometry and computer 3 dimension visual technology, the most effective method to solve sun shadow problem is present.

由此基于投影几何学理论及计算机三维可视化技术，建立了日照阴影问题最有效的方法。

7·Cross ratio and element at infinity are two important concepts with projective geometry and primary tools in considerate projective property of figures.

交比和无穷远元素是射影几何中的两个重要概念，它们是探讨图形射影性质的主要工具。

8·Finally a conclusion is made that projective geometry LDPC codes may be adopted as one of the key technologies in the next wireless communication systems.

最后得出结论，投影几何ld P C码将有可能作为下一代无线通信系统的一项关键技术被广泛采用。

9·In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.

文章利用射影几何方法及配极原理给出二次曲线中点弦存在性定理的证明。

10·Method: First, device parameters and azimuth parameters of analytic geometry model and projective geometry model of coded structured light system were analyzed and unified.

方法：首先，比较分析编码结构光系统的解析几何模型和射影几何模型，统一了二者的设备参数、姿态和位置参数。